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    <title>Document</title>
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    <script>
        /**
         *  * / 算数运算符，会将运算符两侧的值都 Number 一下
         *  
         */

        console.log(10/5);
        console.log('10'/'5');

        console.log(null / 10); // Number(null) ==> 0
        console.log(10 / null);  //    10 / 0 ==>  Infinity

        console.log(NaN * 100); // NaN

        console.log('10' * '2'); // 20




        
    </script>
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